Help! my script won't load, cant find the error?

Hello,

im a bit of a beginner in unity, everything was going fine but now my script wont load anymore, its says that there is no monobehaviour or that the name is not correct, but i can't see where the error is.

Could someone please help me out?

using UnityEngine; using System.Collections.Generic;

public class Test : MonoBehaviour {

 public GameObject cube;
 public int amount;
 public int minL, minR, maxL, maxR;
 
 
 
 // Use this for initialization
 void Start () {
     
     PlaceCubes ();
     
 }
 void PlaceCubes(){
     
     List<Vector3> occupied = new List<Vector3> ();
     
     
     while (occupied.Count <= amount) {
         int x, y, z, random1, random2;
         random1 = UnityEngine.Random.Range (0, 3);
         random2 = UnityEngine.Random.Range (0, 3);
         Debug.Log(random1);
         Debug.Log(random2);
         if (random1 == 1 && random2 == 1) {
             x = UnityEngine.Random.Range (minL, maxL);
             y = 1;
             z = UnityEngine.Random.Range (minL, maxL);
             
         }
         
         if (random1 == 1 && random2 == 2) {
             x = UnityEngine.Random.Range (minL, maxL);
             y = 1;
             z = UnityEngine.Random.Range (minR, maxR);
             
         }
         if (random1 == 2 && random2 == 1) {
             x = UnityEngine.Random.Range (minR, maxR);
             y = 1;
             z = UnityEngine.Random.Range (minL, maxL);
             
         }
         if (random1 == 2 && random2 == 2) {
             x = UnityEngine.Random.Range (minR, maxR);
             y = 1;
             z = UnityEngine.Random.Range (minR, maxR);
             
         }
         
         Vector3 Location = new Vector3 (x, y, z);
         
         
         
         if (!occupied.Contains (Location)) {
             occupied.Add (Location);
             Debug.Log(occupied.Count);
         }
     }
     for (int i = 0; i < amount; i++) {
         Vector3 V = (Vector3)occupied[i];
         
         Instantiate (cube, V, Quaternion.identity);
     }
     
     
 }
 
 
 bool equals(Vector3 thiy, Vector3 that)
 {
     
     return thiy.x == that.x && thiy.z == that.z;
     
 }
 

}

P.s. its probably full of stupid errors, but it did work when it was just placing 30 random cubes for me, things went wrong after i implemented the while loop.

many thanks!